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Nicholas Davies edited Introduction .tex
almost 9 years ago
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\section{Introduction}
Eucalypt species are fast growing and can produce high quality timber for appearance and structural products including LVL. Large growth-strains displayed in eucalypts are associated with log splitting, warp, collapse and brittleheart, imposing substantial costs on processing (--Yamamoto 2007--). Costly mitigation strategies have been developed to reduce growth-strain induced wood defects that have been only partially effective.
As With growth-strain
is being highly
heritable heritable, as is shown here an alternative approach is to select and grow individuals which display low growth-strain. Until now it has been difficult, time consuming and expensive to measure growth-strain, preventing the assessment of the large number of trees needed in a breeding programme.
The largest sample number in any reported growth-strain study was less than 170 trees --- dundii paper---. Traditionally selections are made when trees are older, not only increasing costs (i.e. trial management, sample handling) but also substantially extending the breeding cycle, delaying the deployment of improved germplasm. Developments at the University of Canterbury have resulted in a unique growth-strain measurement method supported by theoretical analysis (Entwistle 2014); dubbed the “Splitting” test it allows for rapid growth-strain assessment on young trees (Chauhan 2010).